| 摘要 |
An audio signal may have a base layer BL and an enhancement layer EL, wherein the EL represents additional information for enhancing the quality of the BL audio content. Decoding of such dual-layer signals usually comprises partial decoding (21) of the BL data, wherein frequency bins of the BL are restored (22), mapping (23) the restored frequency bins to the MDCT domain, adding them to the decoded EL and performing inverse Integer MDCT. A low-complexity method for decoding comprises reverse mapping (45) of the decoded EL data, adding (42) the reverse mapped EL data to the partially decoded BL data and filtering the sum, using the inverse BL filter bank.
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